package com.sp.shopping_common.util;

import java.util.Random;

public class RandomUtil {
  /**
   * 生成验证码
   * @param digit 位数
   * @return
   */
  public static String buildCheckCode(int digit){
    String str = "0123456789";
    StringBuilder sb = new StringBuilder();
    Random random = new Random();
    for (int i = 0; i < digit; i++) {
      char ch = str.charAt(random.nextInt(str.length()));
      sb.append(ch);
     }
    return sb.toString();
   }
}
